<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <div id="app">
        <!-- <input type="text" v-model="message"> -->
<!-- input有一个input事件，监听用户有没有输入东西 -->
        <!-- <input type="text":value="message" v-on:input ="valueChange"> -->
        <!-- <input type="text":value="message" @input ="valueChange"> -->
        <input type="text":value="message" @input ="message = $event.target.value;">

        <h2> {{message}}</h2>
       
    </div>
    <script src="../js/vue.js"></script>
    <script>
        const app = new Vue({
            el:'#app',
            data:{
                message:'你好呀！'
            },
            methods:{
                valueChange(event){
                    // this.message = 'aaaa'
                    this.message = event.target.value;
                    // console.log("----")
                }
            }

        })
    </script>
</body>
</html>